Bollettino dell'Ufficio di presidenza di pesca . Davis. Questo ramo (/I) o Parker e ]>:i i>- nella numerazione delle arcate viscerale seguito il regime previsto da Gegenbauer (1898), incui il primo arco viscerale è rappresentato bj le mascelle superiore ed inferiore, il secondo dal hyoid arch, il terzo bjthe firsl brachiale arch, ecc. Mn Pomolobus ventrale lins arc alimentato da una coppia di un po' più ampia peritonea] rami. Sangue-VASCKLAK SISTEMA OK THK TILK-KIS. 101 sorge a circa 2 cm dalla fine ventrale dell'arteria e corre verso la medianlino, dove si possono unire la corrispondente arteria dell'op

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Bulletin of the Bureau of Fisheries . Davis. This branch (/i) o Parker and ]>:i i>- in numbering the visceral arches followed the scheme laid down by Gegenbauer (1898), inwhich the first visceral arch is represented bj the upper and lower jaws, the second by the hyoid arch, the third bjthe firsl branchial arch, etc. Mn Pomolobus the ventral lins arc supplied by a pair of somewhat larger peritonea] branches. BLOOD-VASCKLAK SYSTEM OK THK TILK-KISH. 101 arises about 2 cm. from the ventral end of the artery and runs toward the medianlino, where it may join the corresponding artery of the opposite side to form a singlevessel—the dorsal median hypobranchial artery {52). As a rule, however, it doesnot roach the median line, but curves caudad dorsal to the fourth division of themusculus obliquus ventralis, and terminates, like the dorsal median hypobranchial, in the musculus constrictor pharyngis and inferior pharyngeal teeth. The branchesof the fifth commissural artery are the dorsal coronary artery (49), which is given. Fig. 12.—Ventral ends of the efferent branchial vessels and their branches in the tile-fish. Ventral aspect, x2. off from either the right or left side, and two pairs of nutrient branches which go tothe fourth (JV) and to the rudimentary fifth (50) branchial arch. In one case thevessel which supplied the rudimentary fifth arch was joined by a branch (51, fig. 12)from the left fourth efferent branchial artery; also, in one individual the fifth com-missural artery was wanting, its place being taken by the sixth, which was presentonly on one side and arose from the fourth efferent branchial vessel. Summing up the arrangement of these vessels in the tile-fish, it will be seenthat the species possesses dorsal as well as ventral coronary arteries, a dorsal and 102 BULLETIN OF THE IUREAT F FISHERIES. ventral median hypobranchial artery, fourth, fifth, and sixth commissural arteries, and indications of a lateral hvpobranchial artery. In individuals of the

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• bookcentury1900
• bookdecade1900
• booksubjectfisheries
• bookyear19